chore: move transport interface tests to integration package #3674

Job	Run time
Build	3m 3s
Test example js-libp2p-example-browser-pubsub	2m 2s
Test example js-libp2p-example-chat	1m 20s
Test example js-libp2p-example-circuit-relay	1m 8s
Test example js-libp2p-example-connection-encryption	58s
Test example js-libp2p-example-custom-protocols	57s
Test example js-libp2p-example-delegated-routing	2m 15s
Test example js-libp2p-example-discovery-mechanisms	1m 0s
Test example js-libp2p-example-peer-and-content-routing	1m 28s
Test example js-libp2p-example-pnet	1m 20s
Test example js-libp2p-example-protocol-and-stream-muxing	50s
Test example js-libp2p-example-pubsub	1m 16s
Test example js-libp2p-example-transports	59s
Test example js-libp2p-example-webrtc-private-to-private	1m 49s
	20m 25s

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